the wiring goes back to the main ECU. The main ECU is underneath the battery tray. On some Jeeps, the battery leaks and acid will drip on to your ECU. Has your shop tried removing the battery and looking underneath the battery tray to see if battery acid has leaked on the ECU?

 

what is the error code ?

 

no battery leak, and the code is p0101. thanks a lot for helping me.

 

Could be caused by intake air leaks or even a dirty air intake filter.

 

i asked them and they checked that twice. he say too that there is a cable with 5 volt. any idea ?

 

I don't have electrical schematics for a WK, but that is probably the 5 V feed for the Mass Airflow sensor, which comes from the PCM.
There seems to be a fuse as well for the Mass Airflow sensor, only don't know the position on the WK. Not sure if the 5V measured before is coming via this fuse.

 

have them clear the code using an OBD2 tool and also disconnect your battery for 5 minutes to reset the PCM.
can you post a photo of your engine compartment including the air filter housing and intake tube? its best to take the photo with the engine cover removed.

I wonder if there is a crack in the air intake tube. The other thing is the throttle control valve. The throttle control valve meters the fresh air versus the EGR air to your intercooler. I would've expected a different code from the throttle control valve, but I suppose anything is possible. No easy way to test the throttle control valve without the proper Chrysler tools.

 

i think the battery was disconnected for more than 5 min, but ill ask them for sure.

here the pic :
http://imageshack.us/a/img846/7734/jeepmoteur1.jpg
http://imageshack.us/a/img805/565/jeepmoteur2.jpg
http://imageshack.us/a/img16/9060/jeepmoteur3.jpg
http://imageshack.us/a/img600/3969/jeepmoteur5.jpg
http://imageshack.us/a/img109/5060/jeepmoteur4.jpg
http://imageshack.us/a/img248/3100/jeepmoteur6.jpg

 

has your jeep been in water? looks to me like the engine compartment was wet at some point and water can do strange things to electronics if it sits long enough.

also, what is that in the bottom of your air box in picture number 5? is it oil? if so, how did oil get there?

there are 2 sensors on the air box lid. One sensor is for Mass Air Flow (MAF). Another sensor is for Mass Air Pressure (MAP). Do you know for sure which sensor they changed? Can you post a part number and a picture of the part that was changed? I wonder which part they changed.

The MAF sensor is 53013673AA and costs at least $80US, probably much more in Quebec, like $125 Canadian.

The MAP sensor is 68066040AA and costs at least $40US, probably much more in Quebec, like $75 Canadian.

A MAF sensor looks very different from a MAP sensor.

 

never was in water for long time, not me, but i have it since a few month.

in picture 5 its not oil, its ice, there was a little piece of ice

for MAF or MAP i dont remember de price, but its the one that you need to remove the part right after air filter, ill take a pic of the old one tomorow, if i have time its starting to snow a lot here.

thanks for the help

 

here the pic of the piece that was changed

ImageShack® - Online Photo and Video Hosting

 

that is definitely a MAF sensor.

Is the vehicle operating (driving and performing) as normal with the check engine light on? I sometimes unplug my MAF sensor because the fuel economy goes up and the vehicle operates as normal with the MAF unplugged, the problem is that the check engine light comes on and the engine takes longer to warm up with the MAF unplugged. A check engine light message also disables the remote start and I think it disables the diesel particulate filter regeneration.

What exactly is the OBDII code you get now? P0101? I get a P0101 code when I unplug my MAF.

 

bump, i really need to find the trouble on my jeep.

thanks.

 

As I recall, there are 4 wires going to the maf sensor. Ground, +5 volts, maf wire (pwm signal), temperature wire (pwm signal). A short in any of these would cause a p0101. All of these are connected to the ecm module. Have all these wires been tested? I can confirm the wiring including the colors if it will help you.

 

More details on troubleshooting the p0101 from the alldatadiy subscription

Diagnostic Test*

Section 1. DTC IS ACTIVE*
Ignition on, engine not running.
With the scan tool, clear DTCs in the Engine Control Module (ECM).
Start the engine and allow it to reach normal operating temperature.
With the scan tool, select View DTCs.
Is the status Active for this DTC?*




Yes*




Go To Section 2

Section 2. (K157) MASS AIR FLOW SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE

(refer to Section 2 picture)

Turn the ignition off.
Disconnect the Mass Air Flow Sensor harness connector.
Turn the ignition on.
Measure the voltage of the (K157) Mass Air Flow Sensor Signal circuit in the Mass Air Flow Sensor harness connector.
Is there any voltage present?

Yes

Repair the (K157) Mass Air Flow Sensor Signal circuit for a short to voltage.
Perform the ECM Verification Test Ver. 1. See: Verification Tests\Powertrain Verification Test
No

Go to Section 3

Section 3. (K957) MASS AIR FLOW SENSOR GROUND CIRCUIT SHORTED TO VOLTAGE

(refer to Section 3 picture)

Measure the voltage of the (K957) Mass Air Flow Sensor Ground circuit in the Mass Air Flow Sensor harness connector.
Is there any voltage present?

Yes

Repair the (K957) Mass Air Flow Sensor Ground circuit for a short to voltage.
Perform the ECM Verification Test Ver. 1. See: Verification Tests\Powertrain Verification Test
No

Go to Section 4

Section 4. (F944) IGNITION SWITCH OUTPUT (RUN-START) CIRCUIT OPEN OR HIGH RESISTANCE

(refer to Section 4 picture)

Using a 12 volt test light connected to ground, check the (F944) Ignition Switch Output (Run-Start) circuit in the Mass Air Flow Sensor harness connector.

NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.

Is the test light illuminated and bright?

Yes

Go to Section 5

No

Repair the (F944) Ignition Switch Output (Run-Start) circuit for an open circuit or high resistance.
Perform the ECM Verification Test Ver. 1. See: Verification Tests\Powertrain Verification Test

Section 5. (K157) MASS AIR FLOW SENSOR SIGNAL CIRCUIT OPEN OR HIGH RESISTANCE

(refer to Section 5 picture)

Measure the resistance of the (K157) Mass Air Flow Sensor Signal circuit between the Mass Air Flow Sensor harness connector and the Engine Control Module (ECM) harness connector.
Is the resistance below 10.0 ohms?

Yes

Go to Section 6

No

Repair the (K157) Mass Air Flow Sensor Signal circuit for an open circuit or high resistance.
Perform the ECM Verification Test Ver. 1. See: Verification Tests\Powertrain Verification Test

Section 6. (K957) MASS AIR FLOW SENSOR GROUND CIRCUIT OPEN OR HIGH RESISTANCE

(refer to Section 6 picture)

Measure the resistance of the (K957) Mass Air Flow Sensor Ground circuit between the Mass Air Flow Sensor harness connector and the Engine Control Module (ECM) harness connector.
Is the resistance below 10.0 ohms?

Yes

Go to Section 7

No

Repair the (K957) Mass Air Flow Sensor Ground circuit for an open circuit or high resistance.
Perform the ECM Verification Test Ver. 1. See: Verification Tests\Powertrain Verification Test

Section 7. (K157) MASS AIR FLOW SENSOR SIGNAL CIRCUIT SHORTED TO GROUND

(refer to Section 7 picture)

Measure the resistance between ground and the (K157) Mass Air Flow Sensor Signal circuit in the Mass Air Flow Sensor harness connector.
Is the resistance above 10.0 ohms?

Yes

Go to Section 8

No

Repair the (K157) Mass Air Flow Sensor Signal circuit for a short to ground.
Perform the ECM Verification Test Ver. 1. See: Verification Tests\Powertrain Verification Test

Section 8. (K157) MASS AIR FLOW SENSOR SIGNAL CIRCUIT SHORTED TO THE (K957) MASS AIR FLOW SENSOR GROUND CIRCUIT

(refer to Section 8 picture)

Measure the resistance between the (K157) Mass Air Flow Sensor Signal circuit and the (K957) Mass Air Flow Sensor Ground circuit in the Mass Air Flow Sensor harness connector.
Is the resistance above 10.0 ohms?

Yes

Go to Section 9

No

Repair the (K157) Mass Air Flow Sensor Signal circuit for a short to the (K957) Mass Air Flow Sensor Ground circuit.
Perform the ECM Verification Test Ver. 1. See: Verification Tests\Powertrain Verification Test

Section 9. MASS AIR FLOW SENSOR
Turn the ignition off.
Connect the Engine Control Module (ECM) connector.
Replace the Mass Air Flow Sensor.
Turn the ignition on.
With the scan tool, Clear DTCs.
Start the engine and allow it to reach normal operating temperature.
With the scan tool, select View DTCs.
Is the status Active for this DTC?

Yes

Go to Section 10
No

Test Complete.
Perform the ECM Verification Test Ver. 1. See: Verification Tests\Powertrain Verification Test

Section 10. ENGINE CONTROL MODULE (ECM)
Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Mass Air Flow Sensor and the Engine Control Module (ECM).
Look for any chafed, pierced, pinched, or partially broken wires.
Look for broken, bent, pushed out or corroded terminals.
Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.
Look for the data to change or for the DTC to reset during the wiggle test.
Search for any Technical Service Bulletins that may apply.
Were any problems found?

Yes

Repair as necessary.
Perform the ECM Verification Test Ver. 1. See: Verification Tests
No

Replace the Engine Control Module (ECM).
Perform the ECM Verification Test Ver. 1. See: Verification Tests\Powertrain Verification Test

 

wow thanks a lot, im going to see my mecanic monday with this, thanks.

 

I created a pdf file for you of the information I posted. the pdf should display and print better than the information in this thread.

 

it did not work when they plugged the computer the jeep had almost 20 error code, all gone when reseting. do you think its the computer of the jeep ?

 

yikes!

you may need a new computer.

 

the worst thing for me, its not under waranty after 3 years or 60000km, and not 5 years and 100000km. my jeep is at 95000km and under waranty until march.

im not 100% sure its the computer my problem, i cant buy one only to test and found its not the problem.

do you have any other idea for that problem ? im desperate

 

I've given you all my information based on the materials I have access to. The tedious part of the diagnostics is testing each wire from the MAF sensor back to the computer. Did you actually take it to a dealership and get them to use the starscan to read the codes and provide you a print out? The starscan is better than any other scanning tool because it can read codes that other scanners cannot read so a dealer printout may give you more information.

If you did get the dealership to do the work so far, I would guess that the dealership would just replace the computer after following the same diagnostic procedure.

By the way, if your jeep runs fine, it just has a check engine light with a p0101 code, you could drive it that way for a long time. Certain features that are inherent in the diesel won't work though, like the remote start and diesel particulate filter regeneration. It would also fail an emissions test if you had to take one.

I'm not sure if used computers for the same make/model/year of your jeep are available at junk yards, but you could try that, usually the computer has to be programmed by the dealership after installing because your VIN and mileage have to be programmed in.

 

other info here
P0101 error code - is that just for MAF? - Sprinter-Forum

 

little update, i asked another dealer if the computer was under waranty and they said yes (8 years 160000km). so they tested another computer and after moving a little bit the cable of the computer, the check engine came back. he say its a cable problem, maybe in another cable, not a cable of the mass airflow.

but for now my jeep dont have the check engine... ill wait to see if it come back before to check all the cable of the jeep.

my first dealer is a liar, i wont go here anymore, and it cost me nothing for the computer test, ill go there now.

 

the interesting thing about the p0101 in the sprinter forum is that the code could be activated any time there is a an air leak in any of the pipes that go to or from the turbo. there are many connection points on the jeep but the main issue has been the turbo resonator, it commonly leaks. the easiest way to see a leak is to check for any oil residue on the turbo pipes because oil will get pushed out the leaking area by air pressure. follow all the piping with your hand and visually check for oil on the pipe. the pipe goes around the front of the engine and finally to the intake manifold.

 

How did you resolve this problem? I have been chasing down the same P0101 error message. Based on diagnostic test Susieque provided I am up to the point I need to perform the ECM Verification Test Ver. 1 since the voltage test of Pin 4 (K157) of the Mass Air Flow Sensor harness resulted in 5V. Since you tried another ECM and the P0101 persisted suggesting a harness issue, I am hoping you can point me to the problem area before I start pulling connectors and testing each wire. Thanks,

 

I know the discussion is from 2016.. but who knows!

I have the same problem with pin 4 getting a +5V (same as pin 3)

Did you find the problem?

 

I'm getting a P0101 soft code. I have no CEL and Jeep runs normally. I can clear the code and as soon as I turn the key on the code shows. I ordered a new MAP sensor, and may order a new MAF as well.

 

did you get to the bottom of your p0101 issue?